Grinding, pulverizing, or disintegrating mill



April 1, 1930. w. A. CLOUD 1,752,883

GRINDING, PULVERIZING OR DISINTEGRATING' MILL Filed Jun 14. 1926 3Sheets-Sheet l I April 1, 1930. w. A. CLOUD GRINDING, PULV ERIZINGQORDISIN'IEGRATING MILL Filed June 14. 1926 3 Sheets-Sheet 2 April 1, 1930.

I GRINDING, PULVERIZING, OR DISINTEGBATING MILL Filed June 14. 1926 3Sheets-Sheet 5 IIIIIIIIIIIIIIIIII///////////// 47 w. A. CILOUD 1,752,888

Wi am Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE, v

GRINDING, PULVERIZING, OR DISIN'I'EGRATING MILL Application filed June14, 1926, Serial No 115,975, and in Great Britain July 20, 19 25.

This invention relates to improvements in or connected with grinding,pulverizing or which will especially be suitable for grind ing,pulverizing or disintegrating shellac,

gums, resins, sulphur, coal and like friable materials which aredetrimentally affected by heat and therefore have to be kept cool duringthe operation.

. The invention will now be described, with reference to theaccompanyingdrawings, in which,-

Figure 1 is a longitudinal sectionalelevation of a grinding millconstructed in accordance with the invention, and

Figure 2 is an end elevation, the left half in section of the same;

Figure 3 is a detail view, partly in sec- 20, tion, of a modificationwith co-operating rotary and stationary discs fitted with intermeshingrings at their peripheries, and

Figure 4 shows a portion of one of said rings; 4 Figure 5 is a detailsectional view of the machine provided with a sieve;

Figure 6 illustrates a further modfiication, the parts being jacketed,the figure being partly in section;

Fi ure 7 is a detail view in section and shtzlwlng how one of the rotarydiscs is hollow, an

Figure 8 is an elevation of another modification.

Thus, in a suitable manner of carrying out the present invention theimproved machine comprises one, two or more rotary discs or platesprovided'with a plurality of laterally or other projecting pins or theirequivalents which are adapted to intermesh, or co-operate, with aplurality of laterally or other projecting pins or their equivalentsprovided on one, two or more stationary and co-operating discs orplates, the or eachrotary disc being arranged to revolve in a verticalplane.

The or each pair of opposing and co-operating rotary and stationarydiscs or plates'constitutes a single element and each mill preferablycomprises a plurality of such elements.

59 the case of a machinebeing constructed with two or more compartments21, 22, and so on, the rotary discs 32 and 33, Figures 1 and 2, are ofsmaller diameter than the interior of the compartments in which theyrevolve, and this arrangement is such that they leave-spaces 34 betweentheir peripheries 35 and 36 and the inside 37 of the outer casing forthe passage of the material. Thus, after being ground, pulverized ordisintegrated in the first compartment the material is expanded in saidcompartment into an expansion chamber or area which may be suflicientlylarge to reduce the pressure from that which was operating during thetime the material was passing through the various rotary pins andstationary pins; this actually takes place in all the various comartments between the feed entrance and exit ischarge. In other words,the volumetric area of each expansion chamber at the periphery and theback of a rotary disc should in no case be less than the total sectionalarea of the spaces taken up by all the pins on said rotary andstationary discs and the spaces left between the said pins. The objectof said expansion chamber is to permit the pressure to drop below thatcreated by the fast rotating rotary discs, and to-allow the finelyground, pulverized or disintegrated material to pass over to the nextrotary disc or to the discharge outlet of the machine, whilst the largerparticles of the material are held back and passed through the nextrotary disc in a more uniform condition, the said pins on said nextrotary disc, and on the stationary disc cooperatin with the same,producing a more uniform reaking up of said particles of materialas theypass between the centre of the discs to the next expansion chamber surrounding, or disposed adjacent to, the peripheries of said discs.

The projecting pins or the like-on each rotary disc-32 and 33 arepreferably arranged in a number of concentric circular rows on one sideor both sides thereof,"as are also those on the other stationary andco-operating discs 38 and 39, so that the pins or their equivalents onone of the discs co-operate with the pins or their equivalents on theother disc. The material after passing outwardly between the rows ofpins or the like on the smaller rotary and stationary discs 32 and 38,partly by centrifugal force and also by means of a current of air drawnthrough the mill from the inlet 40 by the centrifugal action of pins ortheir equivalents'on the rotary and stationary discs are of square orother suitable cross-sectional shape havin a plurality of sides whichmay be flat or uted and of a number of angles, and are so arranged inrelation to the paths in which the rotary pins move as to cause thematerial to be diverted or deflected from one dpin to another andthereby effectively groun pulverized or disintegrated. The radius oroutward positions of the pins or their equivalents on each rotary discmay be on the increase from the inlet of the machine to the outletthereof, andthe spaces between the rotary discs and the" stationarydiscs may be reduced as the diameters of the discs in their respectivecompartments increase. In a mill constructed of two or more compartmentseach containing a rotary disc, the discs, the compartments and theportions of the casing surroundin the discs all increase in size fromthe inlet 0 the mill to the outlet of same. The len hs of all theprojecting pins or the like pre erably decrease as the (11808 increasein diameter, and all the pins or the like may be set diamond fashion.The projecting pins'or the like on each disc, when considered from thecentre of the shaft to the periphery of said disc, preferably increasein number gradually in each compartment, thereby increasing the velocityof the material and at the same time packing up the material between therotary and stationary pins or the like. The diameters of the pins or thelike decrease on each rotarydisc and stationar disc and from the centreof same to the periphery thereof, substantially as shown in Figure 2 ofthe drawings, in which the outer pins 42 of therotary disc are ofsmaller diameter than the next inner. ins 43, and, similarly, the outerpins 44 of t e stationary disc are smaller in diameter than the innerpins or the like 45 of said stationary disc. Again, the spacing of theprojecting pins or the like in each row decrease in clearance from thecentre of the disc to the periphery thereof, and this is also the casewith the clearances of spaces between the pins or the like in each rowof the stationary discs or the rotary discs. Thus, the spacing of theprojecting ins or the like from 45 to 42 decrease in distance from theinner pin, to the outer pin and the distance between the pins or thelike in the row 42 are smaller than the pins or the like in the row 44,and so on.

Propeller blades 46 are attached to the back of the last rotary disc 33so as to diminish pressure in the locality of the outlet from themachine of the boss 47 fitted to the said rotary disc, thereby obviatingdust being ejected from the said outlet. An air inlet 48 is provided inthe end plate of the casing and is fitted with a slide or the like 49.This air inlet would assist the blades 46. Alternatively,

, or in conjunction with, the propeller blades 46 a fan blade51 isfitted on the main shaft 50 and between each pair of'compartments which,on rotation, will throw the material from the centre of the machineoutwardly to the sets of ins or the like on the rotary and stationaryisc. Also, in conjunction with or without the propeller blades 46, isfitted at the periphery of the last rotary disc a number of fan blades46 which draw the material, and the current of air which carries it, tothe outside of the rotary disc.

The projecting pins or their equivalents on each disc are provided withwashers 52 which are received in recesses 53 formed in the discs, thusthe better holding said pins or their equivalents 'upon said discs, andthe pins or their equivalents are formed or provided with screw-threadedshanks 54 for engagement with similar holes tapped'in the scs. All ofthe rotary discs are preferably mounted on the one shaft 50 and arefixed in position b one or more splines 55 machined out o the shaft,thus forming one solid connection between the rotary discs and theshaft, said connection being free of all loose parts.

A machine consisting of two or more compartments may be so constructedthat the entire working elements of the machine can be drawn out fromthe end of the latter containing the rotary disc 33 oflargest diameter.Thus, in a preferred construction according to Figure 1, an end cap 56is removed from around the adjacent end of the shaft 50, then two ormore nuts 57 are removed from the end of the shaft, the bolts 58securing in position the bracket or end plate, can be detached thusallowing the said end plate, a driving pulley 59 and an anti-frictionbearing 60 at the end of the shaft to slide out of position on theshaft, the largest rotary disc 33 slidden out of position, the co-oper-.atin stationary disc 39 detached by screwing ack bolts 61 or the likeretaining it in position, the next rotary disc 32 removed, the

stationary disc 38 co operating therewith and secured in position bybolts 62 or the like detached 'and so on, the shaft being removed froman anti-friction bearing 63 provided at the other end.

The bracket or end plate of the casing for supportinlgl the drivin endof the shaft 50, in cases w ere the mac ine is driven by a belt andpulley 59, is made in such a form as to be placed at any suitable angleby rotating said bracket or end plate to an suitable position. Thus, thebracket is olted to the machine by bolts 58 and when it is desired, forinstance, to rotate the bracket so as to change the drive of the pulley59 from an overhead shaft to another shaft near the ground, said bolts58 are removed, said brack-. et is turned and held in such position, andthe bolts are screwed back. I

A ring of pins 70, Figures 3 and 4, are fitted to the periphery of anyrotary disc and adapted to mesh with and rub against a similar ring ofpins 71 fitted on the corresponding stationary disc, said rings of pinsbeing provided with interru tions 72 so as toallow the material to passetween said rings of P1115.

A rotary screen 73, Figure 5, is provided, for instance, between thelast compartment and the discharge outlet and set at an angle, so thatthe particles of material too large to pass throughthe mesh of thescreen can be discharged from the machine through the outlet. Theordinary and required fine'ly divided material passes outwardly from themachine through the rotary screen and through a separate dischargeoutlet 74.

The machine 'may be jacketed in one or more compartments for heating orcooling purposes such as by steam, water or air; see for instance Figure6, in which the compartments are jacketed at 34. The or each r0 tarydisc or stationary disc is made up in sections with intervening spacesfor heating or cooling. For instance, the or each rotary disc 32, Figure7, is formed hollow and is mounted on a shaft which is formed hollow at50 and 50, so that the steam, water or air passes along the shaft at, 50to one side 76 of the interior of the disc,flows outwardly along theinterior, passes around a divisional plate 77 and then flows backwardlyon the other side 78 of the interior to the portions 50 of the hollowshaft. Machines constructed on these principles are practicallywatertight and adapted for wet grinding, pulverizing or disintegratingin closed or open circuit with suitable discharge of the water at one orall of the compartments. In a suitable arrangement, shown in Figure 8, aclosed tank 79 is provided at the top of the machine and is furnishedwith an inlet 80 from the larger compartment of the machine, with anoutlet 81 to the smaller compartment, with a baflle late' 82, and withmeans whereby the fluid ows down the outlet 81, around the machine and uwardly through the inlet 80, it is eflected or partially held up by theaflle plate and again enters the outlet 81, and its operation repeated.

chine and then pass out through the discharge outlet in the form of'afine powder; The

machine isalso adaptable for use in grinding, pulverizing ordisintegrating sulphur, sticky gums and the like, in that it maintains acool temperature throughout the complete operation; in fact the materialleaves the machine at a cooler temperature than when it enters the same,the centrifugal action of the rotary discs setting up acontinuouscurrent of air of high pressure, so that the material is not likely toget heated during the operation.

What I claim is 1. A grinding, pulverizing or disintegrating millincluding cooperating airs of disks, one disk of each pair being xed andthe other disk of each pair being rotary, cooperating pins on the disksof each pair for treating the material, propeller blades attached to oneof the rotary disks, and a fan blade to assist in directing materialfrom the 7 center of the machine outwardly to said pins.

2. A grinding, pulverizing or disintegrating mill including successivelyarranged co operating pairs of disks, one disk of each pair being fixedand the other disk of each pair being rotary, cooperating pins on thedisks of each pair for treating the material, propeller blades securedto the back of the rotary disk of the final pair to diminish pressure inthe locality of the outlet, and fan blades at the periphery of saidrotary disk of the final pan.

3. A grinding, pulverizing or disintegrating mill including a casing, ashaft operating therein, a plurality of cooperating pairs of disksarranged in succession on said shaft,

outlet of the casing to avoid ejectment of dust.

In testimony whereof I have hereunto signed my name.

WALTER AMELIUS CLOUD.

